How to Remove Cache in Wkwebview

Xamarin iOS clear cache from WKWebView

From this question looks like you do this (c# version) for iOS 9 and it will print out which records are deleted:

var websiteDataTypes = new NSSet<NSString>(new []
{
    //Choose which ones you want to remove
    WKWebsiteDataType.Cookies,
    WKWebsiteDataType.DiskCache,
    WKWebsiteDataType.IndexedDBDatabases,
    WKWebsiteDataType.LocalStorage,
    WKWebsiteDataType.MemoryCache,
    WKWebsiteDataType.OfflineWebApplicationCache,
    WKWebsiteDataType.SessionStorage,
    WKWebsiteDataType.WebSQLDatabases
});

WKWebsiteDataStore.DefaultDataStore.FetchDataRecordsOfTypes (websiteDataTypes, (NSArray records) =>
{
    for (nuint i = 0; i < records.Count; i++) {
        var record = records.GetItem<WKWebsiteDataRecord> (i);

        WKWebsiteDataStore.DefaultDataStore.RemoveDataOfTypes (record.DataTypes, 
            new[] {record}, () => {Console.Write($"deleted: {record.DisplayName}");});
    }
});

Or for iOS 8, from ShingoFukuyama/WKWebViewTips you could check the subdirectories Cookies, Caches, WebKit in the Library directory are removed.

iOS 8

After much trial and error, I've reached the following conclusion:

Use NSURLCache and NSHTTPCookie to delete cookies and caches in the same way as you used to do on UIWebView.

If you use WKProccessPool, re-initialize it.

Delete Cookies, Caches, WebKit subdirectories in the Library directory.

Delete all WKWebViews

How to delete WKWebview cookies

Apple released new APIs for iOS 9, so now we can remove domain specific cookies stored for WKWebView with below code, but this will only work on devices with iOS version 9 or later:

Below is the Swift 3 version

let dataStore = WKWebsiteDataStore.default()
    dataStore.fetchDataRecords(ofTypes: WKWebsiteDataStore.allWebsiteDataTypes()) { (records) in
        for record in records {
            if record.displayName.contains("facebook") {
                dataStore.removeData(ofTypes: WKWebsiteDataStore.allWebsiteDataTypes(), for: [record], completionHandler: {
                    print("Deleted: " + record.displayName);
                })
            }
        }
    }

And Swift 4:

let dataStore = WKWebsiteDataStore.default()
dataStore.fetchDataRecords(ofTypes: WKWebsiteDataStore.allWebsiteDataTypes()) { records in
  dataStore.removeData(
    ofTypes: WKWebsiteDataStore.allWebsiteDataTypes(),
    for: records.filter { $0.displayName.contains("facebook") },
    completionHandler: completion
  )
}

Objective-C version -

WKWebsiteDataStore *dateStore = [WKWebsiteDataStore defaultDataStore];
[dateStore
   fetchDataRecordsOfTypes:[WKWebsiteDataStore allWebsiteDataTypes]
   completionHandler:^(NSArray<WKWebsiteDataRecord *> * __nonnull records) {
     for (WKWebsiteDataRecord *record  in records) {
       if ( [record.displayName containsString:@"facebook"]) {
         [[WKWebsiteDataStore defaultDataStore]
             removeDataOfTypes:record.dataTypes
             forDataRecords:@[record]
             completionHandler:^{
               NSLog(@"Cookies for %@ deleted successfully",record.displayName);
             }
         ];
       }
     }
   }
 ];

The above snippet will sure work for iOS 9 and later. Unfortunately, if we use WKWebView for iOS versions before iOS 9, we still have to stick to the traditional method and delete the whole cookies storage as below.

NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *cookiesFolderPath = [libraryPath stringByAppendingString:@"/Cookies"];
NSError *errors;
[[NSFileManager defaultManager] removeItemAtPath:cookiesFolderPath error:&errors];

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